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The U2-40 error is the machine telling you that there is a communications error with your CRUM chip.
is there anything at all displayed on the screen??
if there is, press the #, interrupt, C, interrupt in rapid succession. If you don't know what the interrupt button looks like, it is the third button from the right on the control panel. You may have to try it a few times, as with age, the buttons are harder to push so they register that you are pushing them. Once you get into the simulation mode, press 16, then start, and follow the on-screen instructions. once the machine has reset the code, usually shows by going back to the main code screen, then press the CA button, or "clear all".(second button from the right) that will reboot the machine and hopefully clear the code.
enter simulation: pound, interrupt, clear, interrupt, then enter 14, press start,press execute on touch screen, press ca until copier restarts, this is a general clear code, if problem returns you will have a heat problem in the fuser.
Hello sir; F2 have a sub code, press print key to read the sub code, if the sub code is 04,then it means wrong cartridge,wrong country, you can try to reset it;
1, press "#", "interrupt", "c", "interrupt" keys.
2, enter 14 press start.
3, if it work, don't forget give me a good rating.
Try resetting it by the pressing the following buttons on the display in sequence,
#, interrupt, Clear, interrupt,
display should go dead,
then press print, This will clear the error code press CA to get out and return to normal. However if there is still a problem with the fuser, the code will return. Then you may need to have a tech look at what is the problem. Hope that helps...